The lobby of The Shard skyscraper on the preview day to mark the sale of tickets for the 'View from The Shard' experience on October 26, 2012 in London, England. The observation floors of The Shard skyscraper offer 360 degree aspect of London, and at 244m they are twice the height of any other viewing platform in the city. The 'View from The Shard' opens to the general public on February 1, 2013 and costs £24.95 for adults. (Getty Images)
Vicki Hollub will become the most influential woman in the oil and gas industry when she takes over as CEO of Occidental Petroleum in May. In a bleak period for the sector, how will the future boss of one of America’s biggest energy firms cope with the challenges ahead?